[issue33015] Fix function cast warning in thread_pthread.h

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Oh... test_threaded_import started to crash on Python 2.7:

$ ./python -m test  -F -v test_threaded_import
(...)
0:00:00 load avg: 1.06 [  3] test_threaded_import
Trying 20 threads ... OK.
Trying 50 threads ... OK.
Trying 20 threads ... OK.
Segmentation fault (core dumped)

The problem is that PyMem_Malloc() is not thread safe when Python is compiled in debug mode! In release mode, it's safe because PyMem_Malloc() is a thin wrapper to malloc(). But in debug mode, PyMem_Malloc() uses the debug hooks and... pymalloc allocator which is not thread-safe!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33015>
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